End joint for corrugated-pipe sections.



F. M. DOAK.

END JOINT FOB CORRUGATED PIPE SECTIONS.

APPLICATION FILED D150. 10, 1908.

946,207, Patented Jan 11,1910;

' INVENTOR. w g zf I @MM To at-Z'Z- it mayconcern: i

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Be it known that I, Fnnnnnrox M.

a citizen of the United States, residing in the city and county of San-Francisco and State of California, have invented-certain 'hew and useful Improvements in End Joints for Corrugated-Pipe Sections, of

struction of metallic pipe culverts for use in connectionwith all classes of modern construction relative to foundations, arches, cement floors and work' generally of such character, although its use is: mainly designed for culverts designed-for roadways;

the invention residing in the manner "offorming the endjoint of the. pipe sections for securely locking lengths ofpipean or, joining together the securinga tightness. of

the joint. I

Ordinarily the sections: are riveted together, either prior to shipment or; after the sections have been delivered, in. either ease the services of expert .workmen' or 1 unite the sections;

skilled labor beingreq'uired to- 'a'ssenible. and

The present invention riveting othe: sections 'for-theunitingof the same-is disposed of, and in place; thereoi thelends: oi e pipe section are so constructed that the end! ofjone section will.

slip or-fit within the opposing end of an ad-v jacent section, when, by means of: a-suitabIe' clam-p band encircling the loosely-fitted; or joined-ends; the. lap-end of one sectionisdrawn. down or compressed; onto the inserted .end of the::0pposing section 40" pipe sections arecorrngated with the ridg or furrows :Eormedthereby circumferentia For. the carrying outof theinven'tion the disposed, the: securing; clamp band being likewise-corrugated so as, to embrace thezend ridge; or furrow oft-helap section of. the

pipe and; firmly engage thesaine when drawn tight by means of a coupling bolt and compress said ridge or furrow onto the end ridge or furrow of the endv of the pipe section inserted therein, so that. whenthe clamp band is tightened the parts: be firmly interlocke To comprehend the invention reference should be had to the accompanying sheet of drawings, wherein-.

Figure 1 1s a side elevation partly broken which the following is a specification;

The present invention relates to the con-- dispenses with the" 'necessity. of skilled labor in-the assembling 'and unitin or thes'ecti'ons, inasmuch. as the es ly' 'nnnrorn'r ron conuearnn-rrrnsseuens;

' mama cit "Letters r m. 11;, 19.10.

i Application nee December og aoa smain 4ee,ao1.,,- f;

i i illustrating the-ends of pipesections interlocked,- the securing clam band be' partly broken. .lFi $2 is an mg sideelevation oft a. clamp. ban with the. securing bolt positioned, the tightening nut and one of the; lug collarsgbeing detached. Fig. 3 is a plan view of the'clampaband and r ed broken the securi bolt', thebolt nut and collar, I

detached-in ig; Qbeing' in positiom In the drawings,.-thenumerale1 2 desig-' nate interlocking pipe sections, each being formed with one end enlarged to receive the opposing end ofan adjacent pipe section,

Fig;;1 oztvth'e drawings. The' pi e sections ar'ecompos'ed'of galvanized. or lack iron, which corrugated so" that theiridges or furrows 3 formed: therebiyilare circ'umferen- I ti'ally disposed. The sma section. 1 slips into the enlarged. end 0 the plilpe section 2, s em the. ridge or: turrowof 't e smaller. end of ipev section 1 will lieunder the ridge or urrow of. the enlarged end .4=-.1of" the: adjacentfpipegsection. 2, a. slipjoint between the sections being thus made;

)rdi.narily when the' sections are thus: as- .Sem'bled, the overlapping end of onegs'ectionis riveted to the. insertedend. ofthe, adjacent 's e'ction,j which work is'not only slowlamd. I

tedious, but requires the; servlcesoi an ex erend of the ipe u pert. workman and helper. Such manner-of uniting thersectionsis expensive-,and requires a the exercise of. considerable care. This ex- I .ense is dispensed with in the: present case y the. emplo ment of aclamp. band fi,

i which, after. ends of the pipe sections ."1 9

have been loosel united. by the. slip: joint, 1 I

is. placed. arena 4 the 'ioint end of. the. as sembled sections; and rawn ti htso as ,to .9

' compress thela'pend ofionesectlon onto the inserted endofthe'opposing section to cause the end ridge'ori furrow of. one section: to

firmly interlock; with the-inserted. end ridge distance between each air of end lugs 66' is slightly greater at t eir base than the diioo" ameter of the securing bolt 7, which permits of the lugs being slightly contracted at their =upper ends so that the distance between the same at such point will be less than the diameter of the securing bolt, which prevents the bolt fallin from between the said In s, F i 1 of the drawings.

he 0 amp band in length is slightly less 'than the circumference of the overlapping end'of the pipe section 2, say one-eighthof an inch, so that in the drawing ofvthe' separated ends together, the la end ridge or furrow of the enlarged'overapping end of the pipe section 2 W111 be compressed firmly onto the'ridge or furrow of the inserted end of the adjacent pipe section" 1; It will be understood that after corrugating the clamp band circumferentially, the "same then rolled to the externalcircumference of the pipe "to which itis tobeapplied. c To holdth'e ,end lugs 6-6 from spreading when nut 7 is drawn up to tightenthe clam band, the washers 88 are provided,

one. einglinserted between the outer ends of the'lugs 6 and "the head of the bolt 7, and the other between the nut 7" and the outer ends of the" lugs 6. Each washer'is fornied'with an inwardly extension 9, which fits within a recess 9 formed atthe base of the outer'end face of the lugs The collars thus interlock with the end lugs,

66 so that the same are held against displacement during the operation of tightening up of the securing bolt 7. As the clamp band. is drawn together around the loosely fitted ends of the pipe sections, the

pressure strains of the clamp band bear onto the la ridge or furrow of the pipe section 1 at t e points 10 throughout the circumference thereof, which pressure being at an angle to the diameter of the pipe, tends to i draw together the ends of the pipe sections 1 and securelyinterlock the registering end I ridges or furrows ofthe said sections.

It is obvious that as the pressure of the clamp band increases with the sc'rewin up of the securing bolt 7, the tighter t einterlocked ends of the pipe sections will be forced together, making the ends of the pipe sections a solid joint, Inasmuch as the clamp band completely encircles the inter- I locked ends of the pipe-sections, three thicknesses of the meta will occur at the joint, thusmaterially strengthening the joint of the united sections.

By theme of the described invention the pipe sections may be quickly assembled and the' joints thereof made as the Work roesses, and this without the use of skilled abor; thereby materially reducing the expense incident towork of this character,

inasmuch as the simplicity of uniting the sections in the field of work enables the same to be successfully performed by unskilled workmen, and at the same time dispenses with the use of special toolsfor assembling the parts to any required length on the ground.

Having thus described the invention what is claimed as new and desired to be secured by Letters Patent is- 1 "l. The combination with the end furrow of acircumferentially corrugated pipe section of the end furrow of an adjacent corru-' gated pipe section loosely inserted therein, a clamp band encircling the joint of the loosely connected ends of the pipe sections, and means for tightening the clamp band to compress the overlapping furrow of one pipe section onto the inserted furrow of the adjacent pipe section.

v 2.-The means for compressing the lap furrow of a corrugated pipe section onto an inserted furrow of an adjacent pipe section to form an end joint, the same comprising a clamp band which encircles the end joint" of'the pipe sections, bolt lugs projectin from the end portions of the clamp ban a securing bolt working between the said lugs, a tightening nut, and collars interposed between the bolt, the tightening nut and the bolt lugs to hold the lugs against spreadin on the drawing together of the clamp ban to compress the lap furrow of one pipe section onto the inserted furrow of an adjacent pipe section.

band for the descrlbed 3. In a clam ur- .pose,' the com ination with the bolt ugs projecting from the end portions thereof,

of a'securing boltworkin between said lugs, a ti htening nut wor ing on the se-v curing bo t for drawing together the clamp band, a collar interposed'between the head of the bolt and one pair of the bolt lugs, a

N. A. A KER, WM. F. BOOTH.

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